.page-about {
  --about-max: 1180px;
  --about-pad: 20px;
  --about-ridge: rgba(122, 153, 146, 0.22);
  --about-wine-bg: #59162e;
  --about-indigo-bg: #141f4a;
  position: relative;
  color: var(--mist);
  background: var(--deep-green);
  overflow-x: clip;
  padding-bottom: 72px;
}

.page-about::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(47, 227, 208, 0.055) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(47, 227, 208, 0.055) 1px, transparent 1px);
  background-size: 96px 96px;
  pointer-events: none;
  z-index: 0;
}

.page-about > * {
  position: relative;
  z-index: 1;
}

.page-about a {
  color: var(--cyan);
}

.page-about a.btn {
  color: inherit;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  isolation: isolate;
  padding: 52px var(--about-pad) 40px;
}

.page-about .about-hero__field {
  position: absolute;
  top: -24%;
  right: -8%;
  width: 76%;
  height: 142%;
  background: linear-gradient(
    148deg,
    rgba(122, 31, 61, 0.92) 0%,
    rgba(27, 42, 107, 0.6) 52%,
    rgba(11, 43, 38, 0) 86%
  );
  clip-path: polygon(30% 0, 100% 0, 100% 80%, 0 100%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  max-width: var(--about-max);
  margin: 0 auto;
}

.page-about .about-hero__kicker {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-hero__title {
  margin: 0 0 20px;
  max-width: 20ch;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 34px;
  line-height: 1.18;
  letter-spacing: -0.02em;
  color: var(--mist);
}

.page-about .about-hero__lead {
  margin: 0 0 28px;
  max-width: 40em;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(232, 241, 238, 0.82);
}

.page-about .about-hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 面包屑 ---------- */

.page-about .breadcrumb {
  max-width: var(--about-max);
  margin: 0 auto;
  padding: 0 var(--about-pad) 8px;
}

/* ---------- 数字条 ---------- */

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  max-width: var(--about-max);
  margin: 24px auto 0;
  padding: 0 var(--about-pad);
  background: transparent;
}

.page-about .about-stat {
  margin: 0;
  padding: 16px 0 14px;
  border-top: 1px solid var(--about-ridge);
}

.page-about .about-stat__label {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--sage);
}

.page-about .about-stat__num {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 46px;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--bone);
}

.page-about .about-stat__unit {
  margin-left: 4px;
  font-family: var(--font-head);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0;
  color: var(--sage);
}

/* ---------- 章节通用 ---------- */

.page-about .about-section {
  max-width: var(--about-max);
  margin: 0 auto;
  padding: 56px var(--about-pad) 8px;
}

.page-about .about-section--wine,
.page-about .about-section--indigo {
  max-width: none;
  margin-top: 40px;
  padding-top: 48px;
  padding-bottom: 48px;
  position: relative;
}

.page-about .about-section--wine::before,
.page-about .about-section--indigo::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  clip-path: polygon(0 0, 100% 4%, 100% 100%, 0 96%);
}

.page-about .about-section--wine::before {
  background: linear-gradient(180deg, rgba(122, 31, 61, 0.65), rgba(11, 43, 38, 0.9));
}

.page-about .about-section--indigo::before {
  background: linear-gradient(180deg, rgba(27, 42, 107, 0.6), rgba(11, 43, 38, 0.92));
}

.page-about .about-section--wine > *,
.page-about .about-section--indigo > * {
  max-width: var(--about-max);
  margin-left: auto;
  margin-right: auto;
}

.page-about .about-section--wine .section-head,
.page-about .about-section--indigo .section-head {
  padding-left: var(--about-pad);
  padding-right: var(--about-pad);
}

.page-about .section-title {
  max-width: 22ch;
}

.page-about .about-prose {
  max-width: 42em;
  margin: 24px auto 0;
  padding: 0 var(--about-pad);
}

.page-about .about-prose p {
  margin: 0 0 18px;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(232, 241, 238, 0.84);
}

.page-about .about-prose p:last-child {
  margin-bottom: 0;
}

/* ---------- 对位快照 ---------- */

.page-about .about-pair {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  max-width: var(--about-max);
  margin: 28px auto 0;
  padding: 0 var(--about-pad);
}

.page-about .about-pair__cell {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 18px;
  background: rgba(18, 59, 51, 0.62);
  border-left: 2px solid var(--cyan);
}

.page-about .about-pair__k {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-pair__v {
  font-size: 15px;
  line-height: 1.65;
  color: var(--mist);
}

/* ---------- 流程 ---------- */

.page-about .about-flow {
  list-style: none;
  margin: 28px 0 0;
  padding: 0 var(--about-pad);
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

.page-about .about-flow__step {
  position: relative;
  padding: 20px 20px 22px;
  background: rgba(18, 59, 51, 0.55);
  border: 1px solid var(--about-ridge);
  border-radius: 2px;
}

.page-about .about-flow__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--ember);
  margin-bottom: 10px;
}

.page-about .about-flow__title {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--bone);
}

.page-about .about-flow__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(232, 241, 238, 0.78);
}

.page-about .about-flow__arrow {
  display: none;
  width: 26px;
  height: 13px;
  color: var(--cyan);
}

/* ---------- 配图 ---------- */

.page-about .about-figure {
  position: relative;
  margin: 32px auto 0;
  max-width: var(--about-max);
  padding: 0 var(--about-pad);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border: 1px solid var(--about-ridge);
  filter: saturate(0.86) contrast(1.04);
}

.page-about .about-figure__cap {
  margin: 12px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--sage);
}

/* ---------- 更新节奏 ---------- */

.page-about .about-cadence {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  max-width: var(--about-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--about-pad);
  padding-right: var(--about-pad);
}

.page-about .about-cadence__row {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 0;
  border-top: 1px solid var(--about-ridge);
}

.page-about .about-cadence__row:last-child {
  border-bottom: 1px solid var(--about-ridge);
}

.page-about .about-cadence__key {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--amber);
}

.page-about .about-cadence__val {
  font-size: 15px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 版本时间轴 ---------- */

.page-about .about-versions {
  max-width: var(--about-max);
  margin: 28px auto 0;
  padding: 0 var(--about-pad);
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}

.page-about .about-versions__side {
  order: 2;
}

.page-about .about-versions__img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border: 1px solid var(--about-ridge);
  opacity: 0.9;
}

.page-about .about-track {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .about-track::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan), rgba(47, 227, 208, 0.08));
}

.page-about .about-track__item {
  position: relative;
  display: grid;
  grid-template-columns: 32px 1fr;
  column-gap: 14px;
  padding: 0 0 30px;
}

.page-about .about-track__dot {
  position: absolute;
  left: 0;
  top: 6px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--deep-green);
  border: 2px solid var(--cyan);
}

.page-about .about-track__ver {
  grid-column: 1;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 22px;
  line-height: 1;
  color: var(--ember);
  padding-top: 2px;
}

.page-about .about-track__year {
  grid-column: 2;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--sage);
  margin-bottom: 6px;
}

.page-about .about-track__body {
  grid-column: 2;
}

.page-about .about-track__title {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--bone);
}

.page-about .about-track__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: rgba(232, 241, 238, 0.78);
}

/* ---------- 团队 ---------- */

.page-about .about-team {
  max-width: var(--about-max);
  margin: 26px auto 0;
  padding: 0 var(--about-pad);
  display: grid;
  gap: 20px;
}

.page-about .about-team__row {
  padding: 22px 20px;
  background: rgba(245, 241, 232, 0.05);
  border: 1px solid var(--about-ridge);
  border-left: 3px solid var(--ember);
}

.page-about .about-team__title {
  margin: 14px 0 8px;
  font-family: var(--font-head);
  font-size: 19px;
  font-weight: 700;
  color: var(--bone);
}

.page-about .about-team__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: rgba(232, 241, 238, 0.78);
}

/* ---------- 长期使用 ---------- */

.page-about .about-trust {
  max-width: var(--about-max);
  margin: 26px auto 0;
  padding: 0 var(--about-pad);
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
}

.page-about .about-trust__item {
  padding: 22px 0;
  border-top: 1px solid var(--about-ridge);
}

.page-about .about-trust__item:last-child {
  border-bottom: 1px solid var(--about-ridge);
}

.page-about .about-trust__title {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 19px;
  font-weight: 700;
  color: var(--bone);
}

.page-about .about-trust__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: rgba(232, 241, 238, 0.78);
}

/* ---------- 属地 ---------- */

.page-about .about-section--home {
  max-width: none;
  margin-top: 56px;
  padding: 0;
}

.page-about .about-home {
  max-width: var(--about-max);
  margin: 0 auto;
  padding: 40px var(--about-pad) 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  position: relative;
}

.page-about .about-home::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, rgba(122, 31, 61, 0.4), rgba(11, 43, 38, 0) 68%);
  clip-path: polygon(0 6%, 100% 0, 100% 100%, 0 94%);
  pointer-events: none;
}

.page-about .about-home__body {
  position: relative;
}

.page-about .about-home__text {
  margin: 8px 0 14px;
  max-width: 42em;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(232, 241, 238, 0.84);
}

.page-about .about-home__link {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
}

.page-about .about-home__figure {
  margin: 0;
  position: relative;
}

.page-about .about-home__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
  border: 1px solid var(--about-ridge);
}

/* ---------- 结论块 ---------- */

.page-about .about-close {
  max-width: var(--about-max);
  margin: 48px auto 0;
  padding: 28px var(--about-pad);
}

.page-about .about-close__text {
  margin: 14px 0 22px;
  max-width: 42em;
  font-size: 16px;
  line-height: 1.8;
}

.page-about .about-close__text a {
  color: var(--ember-deep);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-close__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-close__cta .btn--quiet {
  color: var(--charcoal);
}

/* ---------- 响应式 ---------- */

@media (min-width: 720px) {
  .page-about {
    --about-pad: 32px;
  }

  .page-about .about-hero {
    padding: 76px var(--about-pad) 56px;
  }

  .page-about .about-hero__title {
    font-size: 46px;
    max-width: 18ch;
  }

  .page-about .about-hero__lead {
    font-size: 17px;
  }

  .page-about .about-stats {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 1px 24px;
  }

  .page-about .about-stat__num {
    font-size: 54px;
  }

  .page-about .about-section {
    padding-top: 76px;
  }

  .page-about .about-section--wine,
  .page-about .about-section--indigo {
    padding-top: 64px;
    padding-bottom: 64px;
  }

  .page-about .about-pair {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1px 16px;
  }

  .page-about .about-flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .about-flow__step {
    padding: 24px 22px 26px;
  }

  .page-about .about-flow__arrow {
    display: block;
    position: absolute;
    right: -20px;
    top: 50%;
    transform: translateY(-50%);
    z-index: 2;
  }

  .page-about .about-flow__step:nth-child(2) .about-flow__arrow {
    display: none;
  }

  .page-about .about-cadence__row {
    flex-direction: row;
    align-items: baseline;
    gap: 24px;
  }

  .page-about .about-cadence__key {
    flex: 0 0 210px;
  }

  .page-about .about-versions {
    grid-template-columns: 240px minmax(0, 1fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .about-versions__side {
    order: 0;
    position: sticky;
    top: 80px;
  }

  .page-about .about-track__item {
    grid-template-columns: 48px 1fr;
    column-gap: 18px;
    padding-bottom: 34px;
  }

  .page-about .about-track__ver {
    font-size: 26px;
  }

  .page-about .about-track__title {
    font-size: 22px;
  }

  .page-about .about-team {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .about-trust {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1px 40px;
  }

  .page-about .about-trust__item:nth-last-child(-n + 2) {
    border-bottom: 1px solid var(--about-ridge);
  }

  .page-about .about-home {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: center;
    gap: 40px;
  }
}

@media (min-width: 1080px) {
  .page-about .about-hero__field {
    width: 62%;
  }

  .page-about .about-hero__title {
    font-size: 58px;
  }

  .page-about .about-stat__num {
    font-size: 62px;
  }

  .page-about .about-flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-flow__step:nth-child(2) .about-flow__arrow {
    display: block;
  }

  .page-about .about-flow__step:nth-child(4) .about-flow__arrow {
    display: none;
  }

  .page-about .about-versions {
    grid-template-columns: 300px minmax(0, 1fr);
  }

  .page-about .about-track__item {
    grid-template-columns: 60px 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
  }
}